[PATCH] mv643xx_eth: Add multicast support

This code is adapted from code in a ppc-specific version of the driver.

Signed-off-by: Dale Farnsworth <dale@farnsworth.org>

 mv643xx_eth.c |  201 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 197 insertions(+), 4 deletions(-)
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 197 insertions, 4 deletions

diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index 88a59d9715ac..f100ca7d3ee2 100644
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -80,6 +80,7 @@
 static int eth_port_link_is_up(unsigned int eth_port_num);
 static void eth_port_uc_addr_get(struct net_device *dev,
                                                 unsigned char *MacAddr);
+static void eth_port_set_multicast_list(struct net_device *);
 static int mv643xx_eth_real_open(struct net_device *);
 static int mv643xx_eth_real_stop(struct net_device *);
 static int mv643xx_eth_change_mtu(struct net_device *, int);
@@ -269,6 +270,8 @@ static void mv643xx_eth_set_rx_mode(struct net_device *dev)
                 mp->port_config &= ~(u32) MV643XX_ETH_UNICAST_PROMISCUOUS_MODE;
 
         mv_write(MV643XX_ETH_PORT_CONFIG_REG(mp->port_num), mp->port_config);
+
+        eth_port_set_multicast_list(dev);
 }
 
 /*
@@ -2045,6 +2048,196 @@ static int eth_port_uc_addr(unsigned int eth_port_num, unsigned char uc_nibble,
 }
 
 /*
+ * The entries in each table are indexed by a hash of a packet's MAC
+ * address.  One bit in each entry determines whether the packet is
+ * accepted.  There are 4 entries (each 8 bits wide) in each register
+ * of the table.  The bits in each entry are defined as follows:
+ *      0       Accept=1, Drop=0
+ *      3-1     Queue                   (ETH_Q0=0)
+ *      7-4     Reserved = 0;
+ */
+static void eth_port_set_filter_table_entry(int table, unsigned char entry)
+{
+        unsigned int table_reg;
+        unsigned int tbl_offset;
+        unsigned int reg_offset;
+
+        tbl_offset = (entry / 4) * 4;   /* Register offset of DA table entry */
+        reg_offset = entry % 4;         /* Entry offset within the register */
+
+        /* Set "accepts frame bit" at specified table entry */
+        table_reg = mv_read(table + tbl_offset);
+        table_reg |= 0x01 << (8 * reg_offset);
+        mv_write(table + tbl_offset, table_reg);
+}
+
+/*
+ * eth_port_mc_addr - Multicast address settings.
+ *
+ * The MV device supports multicast using two tables:
+ * 1) Special Multicast Table for MAC addresses of the form
+ *    0x01-00-5E-00-00-XX (where XX is between 0x00 and 0x_FF).
+ *    The MAC DA[7:0] bits are used as a pointer to the Special Multicast
+ *    Table entries in the DA-Filter table.
+ * 2) Other Multicast Table for multicast of another type. A CRC-8bit
+ *    is used as an index to the Other Multicast Table entries in the
+ *    DA-Filter table.  This function calculates the CRC-8bit value.
+ * In either case, eth_port_set_filter_table_entry() is then called
+ * to set to set the actual table entry.
+ */
+static void eth_port_mc_addr(unsigned int eth_port_num, unsigned char *p_addr)
+{
+        unsigned int mac_h;
+        unsigned int mac_l;
+        unsigned char crc_result = 0;
+        int table;
+        int mac_array[48];
+        int crc[8];
+        int i;
+
+        if ((p_addr[0] == 0x01) && (p_addr[1] == 0x00) &&
+            (p_addr[2] == 0x5E) && (p_addr[3] == 0x00) && (p_addr[4] == 0x00)) {
+                table = MV643XX_ETH_DA_FILTER_SPECIAL_MULTICAST_TABLE_BASE
+                                        (eth_port_num);
+                eth_port_set_filter_table_entry(table, p_addr[5]);
+                return;
+        }
+
+        /* Calculate CRC-8 out of the given address */
+        mac_h = (p_addr[0] << 8) | (p_addr[1]);
+        mac_l = (p_addr[2] << 24) | (p_addr[3] << 16) |
+                        (p_addr[4] << 8) | (p_addr[5] << 0);
+
+        for (i = 0; i < 32; i++)
+                mac_array[i] = (mac_l >> i) & 0x1;
+        for (i = 32; i < 48; i++)
+                mac_array[i] = (mac_h >> (i - 32)) & 0x1;
+
+        crc[0] = mac_array[45] ^ mac_array[43] ^ mac_array[40] ^ mac_array[39] ^
+                 mac_array[35] ^ mac_array[34] ^ mac_array[31] ^ mac_array[30] ^
+                 mac_array[28] ^ mac_array[23] ^ mac_array[21] ^ mac_array[19] ^
+                 mac_array[18] ^ mac_array[16] ^ mac_array[14] ^ mac_array[12] ^
+                 mac_array[8]  ^ mac_array[7]  ^ mac_array[6]  ^ mac_array[0];
+
+        crc[1] = mac_array[46] ^ mac_array[45] ^ mac_array[44] ^ mac_array[43] ^
+                 mac_array[41] ^ mac_array[39] ^ mac_array[36] ^ mac_array[34] ^
+                 mac_array[32] ^ mac_array[30] ^ mac_array[29] ^ mac_array[28] ^
+                 mac_array[24] ^ mac_array[23] ^ mac_array[22] ^ mac_array[21] ^
+                 mac_array[20] ^ mac_array[18] ^ mac_array[17] ^ mac_array[16] ^
+                 mac_array[15] ^ mac_array[14] ^ mac_array[13] ^ mac_array[12] ^
+                 mac_array[9]  ^ mac_array[6]  ^ mac_array[1]  ^ mac_array[0];
+
+        crc[2] = mac_array[47] ^ mac_array[46] ^ mac_array[44] ^ mac_array[43] ^
+                 mac_array[42] ^ mac_array[39] ^ mac_array[37] ^ mac_array[34] ^
+                 mac_array[33] ^ mac_array[29] ^ mac_array[28] ^ mac_array[25] ^
+                 mac_array[24] ^ mac_array[22] ^ mac_array[17] ^ mac_array[15] ^
+                 mac_array[13] ^ mac_array[12] ^ mac_array[10] ^ mac_array[8]  ^
+                 mac_array[6]  ^ mac_array[2]  ^ mac_array[1]  ^ mac_array[0];
+
+        crc[3] = mac_array[47] ^ mac_array[45] ^ mac_array[44] ^ mac_array[43] ^
+                 mac_array[40] ^ mac_array[38] ^ mac_array[35] ^ mac_array[34] ^
+                 mac_array[30] ^ mac_array[29] ^ mac_array[26] ^ mac_array[25] ^
+                 mac_array[23] ^ mac_array[18] ^ mac_array[16] ^ mac_array[14] ^
+                 mac_array[13] ^ mac_array[11] ^ mac_array[9]  ^ mac_array[7]  ^
+                 mac_array[3]  ^ mac_array[2]  ^ mac_array[1];
+
+        crc[4] = mac_array[46] ^ mac_array[45] ^ mac_array[44] ^ mac_array[41] ^
+                 mac_array[39] ^ mac_array[36] ^ mac_array[35] ^ mac_array[31] ^
+                 mac_array[30] ^ mac_array[27] ^ mac_array[26] ^ mac_array[24] ^
+                 mac_array[19] ^ mac_array[17] ^ mac_array[15] ^ mac_array[14] ^
+                 mac_array[12] ^ mac_array[10] ^ mac_array[8]  ^ mac_array[4]  ^
+                 mac_array[3]  ^ mac_array[2];
+
+        crc[5] = mac_array[47] ^ mac_array[46] ^ mac_array[45] ^ mac_array[42] ^
+                 mac_array[40] ^ mac_array[37] ^ mac_array[36] ^ mac_array[32] ^
+                 mac_array[31] ^ mac_array[28] ^ mac_array[27] ^ mac_array[25] ^
+                 mac_array[20] ^ mac_array[18] ^ mac_array[16] ^ mac_array[15] ^
+                 mac_array[13] ^ mac_array[11] ^ mac_array[9]  ^ mac_array[5]  ^
+                 mac_array[4]  ^ mac_array[3];
+
+        crc[6] = mac_array[47] ^ mac_array[46] ^ mac_array[43] ^ mac_array[41] ^
+                 mac_array[38] ^ mac_array[37] ^ mac_array[33] ^ mac_array[32] ^
+                 mac_array[29] ^ mac_array[28] ^ mac_array[26] ^ mac_array[21] ^
+                 mac_array[19] ^ mac_array[17] ^ mac_array[16] ^ mac_array[14] ^
+                 mac_array[12] ^ mac_array[10] ^ mac_array[6]  ^ mac_array[5]  ^
+                 mac_array[4];
+
+        crc[7] = mac_array[47] ^ mac_array[44] ^ mac_array[42] ^ mac_array[39] ^
+                 mac_array[38] ^ mac_array[34] ^ mac_array[33] ^ mac_array[30] ^
+                 mac_array[29] ^ mac_array[27] ^ mac_array[22] ^ mac_array[20] ^
+                 mac_array[18] ^ mac_array[17] ^ mac_array[15] ^ mac_array[13] ^
+                 mac_array[11] ^ mac_array[7]  ^ mac_array[6]  ^ mac_array[5];
+
+        for (i = 0; i < 8; i++)
+                crc_result = crc_result | (crc[i] << i);
+
+        table = MV643XX_ETH_DA_FILTER_OTHER_MULTICAST_TABLE_BASE(eth_port_num);
+        eth_port_set_filter_table_entry(table, crc_result);
+}
+
+/*
+ * Set the entire multicast list based on dev->mc_list.
+ */
+static void eth_port_set_multicast_list(struct net_device *dev)
+{
+
+        struct dev_mc_list      *mc_list;
+        int                     i;
+        int                     table_index;
+        struct mv643xx_private  *mp = netdev_priv(dev);
+        unsigned int            eth_port_num = mp->port_num;
+
+        /* If the device is in promiscuous mode or in all multicast mode,
+         * we will fully populate both multicast tables with accept.
+         * This is guaranteed to yield a match on all multicast addresses...
+         */
+        if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI)) {
+                for (table_index = 0; table_index <= 0xFC; table_index += 4) {
+                         /* Set all entries in DA filter special multicast
+                          * table (Ex_dFSMT)
+                          * Set for ETH_Q0 for now
+                          * Bits
+                          * 0     Accept=1, Drop=0
+                          * 3-1  Queue   ETH_Q0=0
+                          * 7-4  Reserved = 0;
+                          */
+                         mv_write(MV643XX_ETH_DA_FILTER_SPECIAL_MULTICAST_TABLE_BASE(eth_port_num) + table_index, 0x01010101);
+
+                         /* Set all entries in DA filter other multicast
+                          * table (Ex_dFOMT)
+                          * Set for ETH_Q0 for now
+                          * Bits
+                          * 0     Accept=1, Drop=0
+                          * 3-1  Queue   ETH_Q0=0
+                          * 7-4  Reserved = 0;
+                          */
+                         mv_write(MV643XX_ETH_DA_FILTER_OTHER_MULTICAST_TABLE_BASE(eth_port_num) + table_index, 0x01010101);
+        }
+                return;
+        }
+
+        /* We will clear out multicast tables every time we get the list.
+         * Then add the entire new list...
+         */
+        for (table_index = 0; table_index <= 0xFC; table_index += 4) {
+                /* Clear DA filter special multicast table (Ex_dFSMT) */
+                mv_write(MV643XX_ETH_DA_FILTER_SPECIAL_MULTICAST_TABLE_BASE
+                                (eth_port_num) + table_index, 0);
+
+                /* Clear DA filter other multicast table (Ex_dFOMT) */
+                mv_write(MV643XX_ETH_DA_FILTER_OTHER_MULTICAST_TABLE_BASE
+                                (eth_port_num) + table_index, 0);
+        }
+
+        /* Get pointer to net_device multicast list and add each one... */
+        for (i = 0, mc_list = dev->mc_list;
+                        (i < 256) && (mc_list != NULL) && (i < dev->mc_count);
+                        i++, mc_list = mc_list->next)
+                if (mc_list->dmi_addrlen == 6)
+                        eth_port_mc_addr(eth_port_num, mc_list->dmi_addr);
+}
+
+/*
  * eth_port_init_mac_tables - Clear all entrance in the UC, SMC and OMC tables
  *
  * DESCRIPTION:
@@ -2071,11 +2264,11 @@ static void eth_port_init_mac_tables(unsigned int eth_port_num)
 
         for (table_index = 0; table_index <= 0xFC; table_index += 4) {
                 /* Clear DA filter special multicast table (Ex_dFSMT) */
-                mv_write((MV643XX_ETH_DA_FILTER_SPECIAL_MULTICAST_TABLE_BASE
-                                        (eth_port_num) + table_index), 0);
+                mv_write(MV643XX_ETH_DA_FILTER_SPECIAL_MULTICAST_TABLE_BASE
+                                        (eth_port_num) + table_index, 0);
                 /* Clear DA filter other multicast table (Ex_dFOMT) */
-                mv_write((MV643XX_ETH_DA_FILTER_OTHER_MULTICAST_TABLE_BASE
-                                        (eth_port_num) + table_index), 0);
+                mv_write(MV643XX_ETH_DA_FILTER_OTHER_MULTICAST_TABLE_BASE
+                                        (eth_port_num) + table_index, 0);
         }
 }